好氧发酵过程微界面传质耦合模拟分析

微生物好氧发酵过程是一个多相生化反应体系，空气中的氧在气液两相间的传质速率对生化发酵过程有重要影响。而气泡中氧的传递特性是气泡的形态、运动及体系温度、压力和物性综合影响的结果。通过建立两组分空气气泡上升及其氧传质耦合模型，进而采用数值模拟描述好氧发酵体系中微界面体系的强化效果。利用能量耗散理论评价制造微气泡体系的能耗，以获得高性价比的气泡形态和较高的氧利用率。计算结果表明，在预设的工况下，液面高度一定的反应器内，初始半径大于500 μm的气泡会在短时间内逸出体系，造成物料浪费；而气泡初始半径小于100 μm时，其停留时间、传质效率和氧利用率会显著提升。小气泡的生成需要较大的能耗，需要综合生产成本考虑。在不考虑其他因素影响的情况下，体系中的DO值如果维持在20%~30%，可以获得最大的氧气传质速率。     

喷射环流反应器应用研究进展

描述了喷射反应器的结构和工作原理,详细介绍了喷射反应器作为多相反应器在化学化工、生物化学、环境保护和其它领域的应用研究进展,充分显示了喷射反应器的优异性能及其在多个领域中的重要地位,并对其未来的发展进行了展望。     

氨基酸离子液体-MDEA混合水溶液对CO2的降膜吸收

氨基酸离子液体对CO₂吸收速度快,而N-甲基二乙醇胺（MDEA）有较高的CO₂吸收负荷,因此选用四甲基铵甘氨酸（［N₁₁₁₁］［Gly］）与MDEA水溶液复配成混合吸收剂用于CO₂的降膜吸收。用恒定容积法研究了混合吸收剂吸收CO₂的性能,实验结果显示,提高CO₂分压和增大［N₁₁₁₁］［Gly］浓度均能提高混合吸收剂对™ SC3000 (FLIR Systems,Inc.,Portland,OR). For different heating conditions,the temperature profile of the falling liquid film over a heated/cooled solid plate and the effect of heating temperature difference on the liquid distribution were determined. By using the infrared camera,the film width and the interfacial transfer area could be conveniently obtained. It was found that the transverse temperature gradient was much larger than that in the streamwise direction,resulting in significant Marangoni effect that drove the liquid particles from hot (low surface tension) to cold points (high surface tension),inducing novel shrinkage/expansion of the heated/cooled film. The lateral Marangoni effect could therefore strongly affect the interfacial area and thus the transfer process of falling liquid films.     

硅橡胶复合膜用于渗透蒸发的膜传质动力学(Ⅱ)膜内的扩散传质

The pervaporation of organics from dilute aqueous solution through a novel plate composite silicone rubber membrane was investigated. The measured and derived data indicated that the composite membrane possessed very high permeation flux and stable selectivity for dilute organic aqueous solution. Based upon the well- known resistance-in- series model, diffusive mass transfer behavior in membrane was investigated by calculation from the measured data with different skin layer thickness of membranes. The experimental results showed that the diffusive mass transfer coefficient conformed to Arrhenius correlation with temperature and was independent of the flow status. The diffusivities of the given alcohols in membrane had an order of magnitude 10 m-10·s-1 at a wider range of temperature, which is similar to those reported in literatures.     

南京大学多种分离专利技术得到应用

南京大学在塔器分离技术方面紧跟国际前沿步伐,开展从新型规整填料,高效塔板到节能优化等多方面的理论研究与开发应用工作,并获得１１项国家专利,为我国的塔分离技术赶超国际先进水平作出了一份贡献。这１１项专利技术是:（１）无壁流规整填料———ＳＩＮＯＰＡＫ;（２）固定床颗粒规整结构支撑架;（３）９５型大通量塔板;（４）混合箱塔板;（５）液体线分布器———ＬＩＱＤＩＳＴ-Ⅰ型;（６）槽盒式液体分布与再分布器———ＬＩＱＤＩＳＴ-Ⅱ型;（７）液体面分布器———ＬＩＱＤＩＳＴ-Ⅲ;（８）气体分布器与气液分离器;（９）组合式气…